Vulnerability-Lookup

FKIE_CVE-2022-50756

Vulnerability from fkie_nvd - Published: 2025-12-24 13:16 - Updated: 2026-08-04 10:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix mempool alloc size Convert the max size to bytes to match the units of the divisor that calculates the worst-case number of PRP entries. The result is used to determine how many PRP Lists are required. The code was previously rounding this to 1 list, but we can require 2 in the worst case. In that scenario, the driver would corrupt memory beyond the size provided by the mempool. While unlikely to occur (you'd need a 4MB in exactly 127 phys segments on a queue that doesn't support SGLs), this memory corruption has been observed by kfence.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9141144b37f30e3e7fa024bcfa0a13011e546ba9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b1814724e0d7162bdf4799f2d565381bc2251c63
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c89a529e823d51dd23c7ec0c047c7a454a428541
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dfb6d54893d544151e7f480bc44cfe7823f5ad23
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e1777b4286e526c58b4ee699344b0ad85aaf83a0

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dfb6d54893d544151e7f480bc44cfe7823f5ad23",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            },
            {
              "lessThan": "9141144b37f30e3e7fa024bcfa0a13011e546ba9",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            },
            {
              "lessThan": "e1777b4286e526c58b4ee699344b0ad85aaf83a0",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            },
            {
              "lessThan": "b1814724e0d7162bdf4799f2d565381bc2251c63",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            },
            {
              "lessThan": "c89a529e823d51dd23c7ec0c047c7a454a428541",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.87",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-pci: fix mempool alloc size\n\nConvert the max size to bytes to match the units of the divisor that\ncalculates the worst-case number of PRP entries.\n\nThe result is used to determine how many PRP Lists are required. The\ncode was previously rounding this to 1 list, but we can require 2 in the\nworst case. In that scenario, the driver would corrupt memory beyond the\nsize provided by the mempool.\n\nWhile unlikely to occur (you\u0027d need a 4MB in exactly 127 phys segments\non a queue that doesn\u0027t support SGLs), this memory corruption has been\nobserved by kfence."
    }
  ],
  "id": "CVE-2022-50756",
  "lastModified": "2026-08-04T10:18:23.647",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-24T13:16:02.353",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9141144b37f30e3e7fa024bcfa0a13011e546ba9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1814724e0d7162bdf4799f2d565381bc2251c63"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c89a529e823d51dd23c7ec0c047c7a454a428541"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dfb6d54893d544151e7f480bc44cfe7823f5ad23"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e1777b4286e526c58b4ee699344b0ad85aaf83a0"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2022-50756 (GCVE-0-2022-50756)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2026-08-05 08:59

Title

nvme-pci: fix mempool alloc size

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/dfb6d54893d544151…
https://git.kernel.org/stable/c/9141144b37f30e3e7…
https://git.kernel.org/stable/c/e1777b4286e526c58…
https://git.kernel.org/stable/c/b1814724e0d7162bd…
https://git.kernel.org/stable/c/c89a529e823d51dd2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < dfb6d54893d544151e7f480bc44cfe7823f5ad23 (git) Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < 9141144b37f30e3e7fa024bcfa0a13011e546ba9 (git) Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < e1777b4286e526c58b4ee699344b0ad85aaf83a0 (git) Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < b1814724e0d7162bdf4799f2d565381bc2251c63 (git) Affected: 943e942e6266f22babee5efeb00f8f672fbff5bd , < c89a529e823d51dd23c7ec0c047c7a454a428541 (git)
Linux	Linux	Affected: 4.18 Unaffected: 0 , < 4.18 (semver) Unaffected: 5.10.163 , ≤ 5.10.* (semver) Unaffected: 5.15.87 , ≤ 5.15.* (semver) Unaffected: 6.0.17 , ≤ 6.0.* (semver) Unaffected: 6.1.3 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dfb6d54893d544151e7f480bc44cfe7823f5ad23",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            },
            {
              "lessThan": "9141144b37f30e3e7fa024bcfa0a13011e546ba9",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            },
            {
              "lessThan": "e1777b4286e526c58b4ee699344b0ad85aaf83a0",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            },
            {
              "lessThan": "b1814724e0d7162bdf4799f2d565381bc2251c63",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            },
            {
              "lessThan": "c89a529e823d51dd23c7ec0c047c7a454a428541",
              "status": "affected",
              "version": "943e942e6266f22babee5efeb00f8f672fbff5bd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.87",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.163",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.87",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.17",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.3",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-pci: fix mempool alloc size\n\nConvert the max size to bytes to match the units of the divisor that\ncalculates the worst-case number of PRP entries.\n\nThe result is used to determine how many PRP Lists are required. The\ncode was previously rounding this to 1 list, but we can require 2 in the\nworst case. In that scenario, the driver would corrupt memory beyond the\nsize provided by the mempool.\n\nWhile unlikely to occur (you\u0027d need a 4MB in exactly 127 phys segments\non a queue that doesn\u0027t support SGLs), this memory corruption has been\nobserved by kfence."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is in the nvme-pci host driver and is reached only through local block I/O submission to an NVMe namespace, not by parsing network packets or remote NVMe fabrics protocols.\nAC:L - An attacker can reliably craft large O_DIRECT I/Os with a fragmented user buffer to produce ~2\u20134MB requests with a high phys-segment count, forcing the PRP path and the undersized mempool overflow without depending on a race or other uncontrolled state.\nPR:L - Any unprivileged local user who can write to a file on an NVMe-backed filesystem can submit the triggering I/O; raw block-device privileges or root capabilities are not required.\nUI:N - Exploitation requires only attacker-controlled I/O; no separate victim action such as mounting a volume or opening a malicious file is needed.\nS:U - This is a host-kernel heap corruption in the NVMe driver that can escalate privileges within the same OS security authority; it does not cross a VM, IOMMU, or other security boundary by itself.\nC:H - The bug is a heap out-of-bounds write of PRP list pointers past the iod mempool object, which is memory corruption that can be leveraged for arbitrary kernel read primitives under standard heap-exploitation techniques.\nI:H - Out-of-bounds writes into adjacent slab memory enable corruption of kernel objects and control-flow hijacking primitives, so integrity impact is high per OOB-write guidance.\nA:H - The same overflow can crash the kernel (observed under KFENCE) via slab corruption or guard-page faults, producing a full availability loss."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:42.355Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dfb6d54893d544151e7f480bc44cfe7823f5ad23"
        },
        {
          "url": "https://git.kernel.org/stable/c/9141144b37f30e3e7fa024bcfa0a13011e546ba9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1777b4286e526c58b4ee699344b0ad85aaf83a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1814724e0d7162bdf4799f2d565381bc2251c63"
        },
        {
          "url": "https://git.kernel.org/stable/c/c89a529e823d51dd23c7ec0c047c7a454a428541"
        }
      ],
      "title": "nvme-pci: fix mempool alloc size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50756",
    "datePublished": "2025-12-24T13:05:49.635Z",
    "dateReserved": "2025-12-24T13:02:21.545Z",
    "dateUpdated": "2026-08-05T08:59:42.355Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2022-50756

CVE-2022-50756 (GCVE-0-2022-50756)

Tags

Sightings

Nomenclature

Related by attack behaviour